SONNET Echo III Rackmount

3-slot rackmount Thunderbolt 3 to PCIe card expansion system


£1,316.00 Price excludes VAT

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Connect Three Full-length PCIe Cards to Computers with Thunderbolt 3 Ports

The best portable, mini desktop and all-in-one computers feature powerful CPUs and include high-performance Thunderbolt™ ports to support peripherals. But they lack the PCIe expansion slots creative pros need to install specialty adapter cards that enable their workflows by adding video and audio inputs, transcoding data, and connecting to high-speed shared storage and networks. Sonnet has a solution—the Echo™ III Rackmount—a professional Thunderbolt 3 to PCIe card expansion system that enables you to connect three (up to) full-length (12.28 inches long) PCIe cards to your computer at the same time, via a single cable.

The Thunderbolt 3 Link

Plugged into one of your computer’s Thunderbolt 3 ports, the Echo III Desktop system enables you to connect professional PCIe cards (three full-height, single-width cards, or one double-width card plus one single-width card).

Supports Every Thunderbolt 3 Compatible, Non-GPU PCIe Card

Echo III Desktop supports every Thunderbolt 3 compatible, non-GPU PCIe 1.1/2.0/3.0 card available including video capture and transcoding; audio DSP; 6Gb or 12Gb SAS or SATA host bus adapter; 10Gb, 25Gb or Ethernet; SSD storage; and other specialty types to your system.

Avid Pro Tools Qualified

Ready for up to three Pro Tools | HDX PCIe Cards – no extra parts required

At the flick of a switch, the Avid qualified Echo III Desktop system is instantly optimized to support up to three Pro Tools | HDX PCIe cards, with no extra parts necessary! This chassis has been tested and is qualified by Avid Audio group for use with Avid Pro Tools HD 2020 software, and Avid Pro Tools HDX and HD Native systems.

Your Entire Multi-card Pro Tools | HDX System in 4U Rack Space

Sonnet makes it easy to integrate a complete 2- or 3-card Pro Tools | HDX system and a Mac mini® in just 4U of rack space. With the rugged 1U RackMac mini rackmount enclosure plus the 2U Echo III Rackmount you can combine the power of HDX with any Avid Pro Tools hardware I/O for a complete system, including the exciting Pro Tools | MTRX Studio all-in-one audio interface.

Key Features

  • Adds Connectivity & Capabilities
    • Connects up to three high-performance non-GPU PCIe cards via a Thunderbolt 3 cable to your computer lacking expansion slots
  • Pro Tools | HDX Compatible

    • HDX compatibility mode enables use of up to three Pro Tools | HDX PCIe cards with no additional parts needed

  • Broad PCIe Card Compatibility
    • Every Thunderbolt 3 compatible, non-GPU card supported regardless of length or height.
  • Three PCIe 3.0 Slots

    • One x16 plus two x8 slots support three full-height, single-width cards, or one double-width card plus one single-width card.

  • Pro Power

    • Integrated 400W power supply with 75W auxiliary power. Saves energy by powering on/off automatically with the computer.
  • Remarkably Quiet
    • Dual temperature-controlled, variable-speed Noctua fans rated at 17dBA automatically and quietly cool the cards.
  • Two Thunderbolt 3 Ports

    • One port connects to computer; second port supports daisy-chaining of up to five additional Thunderbolt peripheral devices.

  • Rugged Aluminum Housing
    • Provides robust and secure protection

Three PCIe 3.0 Slots and Power to Spare

The Echo III Desktop features one x16 and two x8 PCIe 3.0 slots(1), enabling it to support a wide variety of cards at the same time. To support really power-hungry cards, it integrates a universal 400W power supply and includes a 75W auxiliary power connector for non-GPU cards that require extra power, including the Avid Pro Tools | HDX. Designed without a power switch, the Echo III powers on and off automatically with the connected computer, saving energy in the long run. With no power switch, you can’t forget to turn off the system!

Dual Fans. Ultra-quiet Operation.

Featuring dual Noctua fans, the Echo III Desktop is designed to deliver ultra-quiet operation so that it can be comfortably used in noise-sensitive environments. Rated at 17.1dBA—below the 20dBA ceiling prescribed for use in recording and broadcast studios—the fans spread the spectrum of their noise to minimize the impact at any single frequency. To further ensure negligible noise levels, the fans are temperature-controlled, automatically speeding up and slowing down smoothly as needed, and the enclosure is engineered to optimize airflow over the installed cards to effectively and efficiently cool the system.

Sonnet Thunderbolt 3 Cable & ThunderLok 3

Sonnet includes a 0.7-meter Thunderbolt 3 (40Gbps) cable that transfers data at Thunderbolt 3’s full 2750 MB/s PCIe bandwidth. In addition, Sonnet provides a ThunderLok™ 3 Thunderbolt connector retainer clip(2) that prevents accidental cable disconnections—just slide it over one end of the cable, and then plug in the connector and secure it to the chassis by turning a thumbscrew. Because of its unique design, ThunderLok remains on the cable so it won’t get lost when not in use.


The Sonnet Echo III is also apart of the all new DuoMondo systems that Sonnet have launched. These systems are made up of mix and match enclosures with modules that allow users to create their own custom Thunderbolt expansion systems. To learn more about these modular systems go here.